Pasztor told a judge in a handwritten letter that she's guilty and ready to accept life in prison

Her attorneys are seeking to present a defense of mental disease or defect, saying they believe she cannot fully understand the legal proceedings or help prepare her defense.

Pasztor has also admitted to fatally shooting her neighbor, 65-year-old Frank Macomber, and taking his car

But in the letter, Pasztor said she was competent and would refuse to see another doctor for mental health evaluations.

'I made a lot of bad decisions in my life but this one really did it,' she wrote. 'I am guilty and I accept my consequences thank you so much for your time.'

Pasztor has also admitted to fatally shooting her neighbor, 65-year-old Frank Macomber, and taking his car.

She has not been charged in his death, but prosecutors have said she is a suspect.

Investigators believe Macomber was shot the same day the children were killed. His body was found the next day in a wooded area near Fort Wayne.

Pasztor's letter to Elkhart Circuit Court Judge Terry Shewmaker was dated December 14 but filed with the court on Tuesday, local media reported.

According to investigators, Pasztor parked a car outside the Elkhart Police Department hours after the children were abducted and told an officer her children's bodies were the back seat. Elkhart is about 70 miles northwest of Fort Wayne.

Pasztor (pictured) parked a car outside the Elkhart Police Department hours after the children were abducted and told an officer her children's bodies were the back seat

According to investigators, Pasztor parked a car outside the Elkhart Police Department hours after the children were abducted and told an officer her children's bodies were the back seat. Elkhart is about 70 miles northwest of Fort Wayne.

Pasztor said in an October jailhouse interview with WANE-TV that she decided to kill her children after hearing an Amber Alert for them. She said she killed the children so they would be safe in heaven.

Pasztor, a drug addict, said: 'My kids are in a better place...They don't have no worries no more.'

The children's bodies were found in the back of a car five hours after authorities issued an Amber Alert following their abduction from their grandparents' home, saying they were 'believed to be in extreme danger'.

Pasztor said in an October jailhouse interview with WANE-TV that she decided to kill her children after hearing an Amber Alert for them. Rene and Liliana are pictured here

But Pasztor told WANE-TV the Amber Alert did not save their lives, but did the opposite - she panicked and killed them.

Pasztor told the TV station she also she shot her neighbor Frank Macomber and took his car. She said she arranged to have sex with him in a wooded area and then shot him with his own gun and dumped the gun in a Michigan river.

Prosecutors are seeking a life sentence without parole for Pasztor.

Pasztor has a third child that she left behind.

Her father, Ricky Green, has said: 'I want to say to my daughter who did this, that she is not my daughter any more. I want her to burn.'